Remove Background - Refining BG Area

[dpfl00]

I'm working on removing the dark background on a photo of cardinal flowers. The button under Properties>Quick Actions gets rid of a lot of the background but leaves blobs of black all throughout the bright red flowers.

When I double click on the layer mask, I can hover and even ctrl+click to see a pink outline that is EXACTLY what I would like to keep, but I can't figure out the next step to apply that to the image and erase what's outside of it. Help!

[dpfl00]

Adding the images here in case that's easier than clicking to open the attachments.

[PECourtejoie]

Hi, at the bottom of the right column, select the output options, and pick layer with layer mask: https://helpx.adobe.com/photoshop/using/select-mask.html